Propeller.



S. YEAGER. PROPELLER.

APPLICATION FILED MAY 7,1909.

945,663, Patented Jan.4,1910.

Witnesses UNITED sTA -r E s 'PATE ToFFIoE. 1

SIMON naenn or cnAr'roN, PENNSYLVANIA.

' rnornnnnn.

' Application filed May 7; 1909. Serial No. 494,550.

To all whom it may concern:

- Be it known that I, SIMQN Ymonn, a citizen of the United States of America, residing at Grafton, in the county of Allegheny and State of. Pennsylvania, have invented certain new and useful Improvements in Propellers, of which the following is a specification, reference being had therein-to the accompanying drawing.

.This invention relates to propellers, and the invention has for its primary object to provide a propeller with adjustable blades than can be easily and quickly set at different inclinations, according to the speed desired from the propeller when revolved through the medium of the driven shaft.

Another object of the invention is to provide a propeller with adjustable segment, shaped blades, from which a high degree of efficiency can be obtained from a minimum expenditure of oweri I These and sue 1 other objects as may hereinafter appear are attained by a propeller particularly designed for motor boats and similar vessels, but is applicable, when constructed upon a larger scale, to ocean liners and large ships.

The propeller will be hereinafter considered in detail, and then claimed, and reference will now be had to the drawings forming a part of this specification, wherein there is illustrated a preferred embodiment of the invention,-but it is to be understood that the. structural elements thereof can be of a portion of the propeller, and Fig. 5 is a rear elevation of a three-bladed propeller.

To put my invention into practice, I rovide a driven shaft 1 with a cylindrical ub 2, having the ends thereof exteriorly screw threaded, as at 3. The hub 2 intermediate the ends thereof is provided with a peripheral enlargement or collar 4, and this collar is provided with diametrically op osed cylindrical openings 5, the inner ends 0 said openings terminating in the tapering bore 6 of the hub 2. This tapering bore 6 receives the tapering end 7 of the driven shaft 1 and the hub 2 can be secured uponthetapering end Specification of Iietters Piatent.

Patented Jan. 4, 1910.

7 by a longitudinal key. 8, or by a set screw 9, and in some instances, the-set screw can be used in conjunction with the key 8 as an additional fastenin means for retainingthe hub upon the sha 1.

Detachably mounted upon' the threaded ends of the hub 2 are cone-shaped caps 10 and 1-1. the former having a central opening 12 providing clearance for the shaft 1. These caps 10 and 11 can be looked upon, the hub 2 by set screws 13.

Fitting in the openings 5 of the hub 2 are the cylindrical stems 14 of the blade shanks 15, said shanks having segment shaped blades 16 and 17. The shanks 15 are provided with peripheral grooyes 18, and

adapted to engage in said grooves are set screws 19 adjustably mounted in the rear end of the hub 2, said set screws fiXing the blades 6 and 7 at different inclinations relative to the-hub 2. The shanks 15 bear upon the collar 4 limiting the inward movement of-the stems 14, and these stems are of a less lengththan the openings-5, in order not to contact with the tapering end 7. of the shaft l. The blades 16 and 17 are concavoconvex and their partic'ularshape is conducive to deflecting water with a minimum degree of retardation when the blades are set at a desired angle and revolved through the medium of the shaft 1.

With the blades set at the angle shown in Fig. 3 of the drawings, a low speed can be obtained; but with the blade'16' set at a greater angle relative to the blade 17, a high speed can be obtained. This adjustment of the blades is accomplished by removing the cap 11,= releasing the set screws 19 from engagement with the stems 14, setting the blades at a desired angle or inclination, tightening the set screws 19 and then replacing the cap 11. All of .this can be accomplished without necessarily removing the propeller from a body of Water. 7

As shown in Fig. 5 of the drawings, the hub 2 can be provided with two or more blades, and each blade can be independently adjusted. It is obvious that the propeller can be used in connection with aero-planes, dirigible balloons, and similar air crafts.

Having now described my invention what.

diameter than said stems. each of said stems provided with a peripheral groove and each of saidshanks engaging the outer face of the hub, a segment-shaped blade carried by eachstem, a set screw engaging in the groove of each stem for connecting it to said hub, and cone-shaped caps detachably mounted upon the ends of said hub, one of said caps having an openingf continuous shaft.

F formed therein providing clearance for said 10 \Vitnesses A. J. Tmoo, C. V. BROOKS.

SIMON YEAG ER. 

